Underwater city: transparent wave-like buildings, waterfalls, coral reefs, marine creatures, bionic robots, underwater performances, music festivals, young female mermaid, long green hair, blue scales, singing, stage, jellyfish, pearl microphone, best quality, ultra-detailed, extremely detailed, CG, unity, 8k wallpaper, best illustration, high resolution, delicate, beautiful, floating, multidimensional, masterpiece.